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/*
* Copyright © 2018 Alexey Dobriyan <adobriyan@gmail.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
// Test that open(/proc/*/fd/*) opens the same file.
#undef NDEBUG
#include <assert.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
int main(void)
{
int fd0, fd1, fd2;
struct stat st0, st1, st2;
char buf[64];
int rv;
fd0 = open("/", O_DIRECTORY|O_RDONLY);
assert(fd0 >= 0);
snprintf(buf, sizeof(buf), "/proc/self/fd/%u", fd0);
fd1 = open(buf, O_RDONLY);
assert(fd1 >= 0);
snprintf(buf, sizeof(buf), "/proc/thread-self/fd/%u", fd0);
fd2 = open(buf, O_RDONLY);
assert(fd2 >= 0);
rv = fstat(fd0, &st0);
assert(rv == 0);
rv = fstat(fd1, &st1);
assert(rv == 0);
rv = fstat(fd2, &st2);
assert(rv == 0);
assert(st0.st_dev == st1.st_dev);
assert(st0.st_ino == st1.st_ino);
assert(st0.st_dev == st2.st_dev);
assert(st0.st_ino == st2.st_ino);
return 0;
}
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